article section{
    width: 500px;
    height: 750px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 50px;
    background-color: white;
}
article{
    overflow: hidden;
    height: 900px;
}
.top{
    display: flex;
}
.top aside{
    text-align: center;
    line-height: 50px;
    width: 250px;
    height: 50px;
}
.top aside a{
    text-decoration: none;
    color: black;
    display: inline-block;
    width: 100%;
    height: 100%;
    background-color: #e3e3e3;
}
.usname,.sign,.password,.address,.my,.verification{
    margin-left: 30px;
}
.usname input{
    width: 360px;
}
.password input[type="password"]{
    width: 360px;
}
.sign input{
    height: 30px;
    width: 360px;
    background-color: #81d867;
    color: white;
    border-radius: 8px;
}
article div{
    margin-top: 30px;
}
.verification img{
    margin-left: 30px;
    vertical-align: bottom;
}